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Full text of "The manufacture and properties of iron and steel"

268
METALLURGY OF IRON AND STEEL.
SEC. XlVh.—Comparative physical properties of hand and guide rounds.—The fact that the elongation is as high on thick as on thin angles is contrarjr to a prevailing opinion concerning the effect of surface work upon, rolled steel. Further information is given in
TABLE XIV-L
Effect of Finishing Sx%-inchFlats of Acid Open-Hearth Steel at Different Temperatures.
(A=finished at usual temperature.  B = finished at a low red heat.)
56000to 1 Tilt, strength; 60000 Ibs. | per sq. in.	Heat No.	Composition; per cent.			Ultimate strength; pounds per square inch.		Elastic limit; pounds per square inch.		Elongation in 8 inches ; per cent.		Beduotion of area; per cent.	
		C. .11 .12 .12 ~12~	P.	Mn.	A.	B.	A.	B. .	A.	B.	A.	B.
	10063 10058 10055		.087 .037 .030	.49 .55 .65	57520 57810 59060	59160 61270 59140 59857	89150 89250 40800	41490 44860 42760	80.50 82.75 28.00	83.25 81.75 80.50	68.0 64.8 67.9	60.9 58.6 69.3
	Av.		.035	.56	5,8130		89738	48087	80.42	81.88	61.9	69.6
°l	10065 10064 10071 10066	.11 .11 .13 .12 "IF	.056 .062 .065 .074	.48 .48 .48 .50	60840 60900 62280 62840	68160 68500 63820 63860	41540 41500 42290 42610	44280 45890 46780 44000	29.25 80.25 82.00 29.25	29.00 80.50 80.00 30.75	61.8 60.6 58.9 61.5	56.5 56.3 60.2 57.8
	Av.		.064	.48	61703	63585	41985	45218	80.19	80.06	60.7	67.6
i 72000 to [ 80000 Ibs.	10041 10045 10048 10061 10084 10047 10068 10042	.28 .23 .21 .25 .25 .25 .26 .26	.047 .052 .049 .062 .059 .045 .062 .042	.77 .86 .75 .68 .78 .80 .79 .76	72780 73060 73340 75300 76860 77340 78280 78540	74500 75910 75840 77280 79430 80260 80880 80560	47010 48660 48580 49400 49840 49460 50860 49930	49090 64240 49900 51600 54920 54800 67220 54900	25.50 25.75 24.00 25.50 22.50 28.75 26.00 24.25	28.75 28.00 28.25 28.50 27.50 26.75 27.50 24.00	69.5 67.8 66.3 50.7 54.4 52.3 48.6 53.8	67.1 61.0 64.6 54.8 61.2 62.4 47.4 «0.8
	Av.	.24	.052	.77	75688	78088	49155	68884	24.66	27.41	54.1	62.3
TABLE XIV-J.
Comparative Physical Properties of Hand Hounds and Guide Eounds from the Same Acid Open-Hearth Heats.
	on	ft	',^5								
	l-ali C,dft.S Site* '	3r of hea oup.	;e manga per cen	Ultimate strength; Ibs. per sq. inch.		Elastic limit ; Ibs. per square inch.		Elongation in 8 inches ; per cent.		Reduction of area; per cent.	
Pi a g	lit" !£&&	•SB. 35	2£ ID 05 krt	•d rt *	1 "3	T3 g	o •d •H £3	1 a	o •d '3	•d i	9 2 rt
O	Hi	fc	•4	w	5	w	.0	W	a	w	s ,
I	56000'to 64000	3	.41	59880	59192	42548	88848	28.28	29.85	55.90	61.85
II	70000 to 75000	5	.76	72464	69750	48024	45601	22.77	24.78	40.77	48.98
III	75000 to 80000	5	JSL	78805	77790	51948	51988	28.55	24.92	46.09	53.80
IV	80000 to 86000	6	.79	88813	82524	52986	52863	22.74	24.51	45.69	55.57
Av. of all heats,		19	.78	75722	74282	49758	48495	28.83	25.44	46.11	64.28